Ringing suppressor circuit
AssigneesSoken, Inc., Denso Corporation
InventorsYouhei Sekiya, Hiroyuki Mori, Tomohisa Kishigami
Life of this patent
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Abstract
A ringing suppressor circuit is connected to a differential signal transmission line that includes a high potential signal line and low potential signal line pair for transmitting high and low level differential signals, and includes a ringing suppressor and a stopper. When the differential signal changes to a high level, the ringing suppressor suppresses ringing by lowering the impedance between the signal lines by turning ON of a switching element. When a differential signal voltage drops below a voltage lowering determination voltage, the stopper stops the impedance lowering function of the ringing suppressor by turning OFF another switching element.
Claims4
A ringing suppressor circuit connected to a transmission line for transmitting a differential signal that switches between a high level and a low level via a high potential and low potential pair of signal lines, and for suppressing a ringing in the differential signal, the ringing suppressor circuit comprising:
- a ringing suppressor configured to lower an impedance between the pair of signal lines when the differential signal switches from the low level to the high level;
- and
- a stopper configured to
- stop the ringing suppressor from lowering the impedance between the pair of signal lines when the stopper determines that a voltage of the differential signal drops below a voltage lowering determination voltage, wherein
- the stopper is further configured to set the voltage lowering determination voltage lower than a differential voltage of the differential signal when the transmission line is transmitting the differential signal at the high level.
Dependencies are inferred from the claim text.